On Tue, 2009-12-08 at 19:43 +0100, Albert Herranz wrote:
> The top portion of MEM2 (the second 64MB memory block) in the Nintendo
> Wii video game console is used by the firmware running on the Starlet
> processor.
>
> Add code to calculate the portion of MEM2 safely useable by the
> Broadway processor. When running under the 'mini' firmware this is
> easily determined from an in-memory header. Otherwise, a safe default
> is used.
>
> Signed-off-by: Albert Herranz <albert_herr...@yahoo.es>
Acked-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> ---
> arch/powerpc/boot/wii.c | 118 +++++++++++++++++++++++++++++++++++++++++++++-
> 1 files changed, 115 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/boot/wii.c b/arch/powerpc/boot/wii.c
> index d0e2625..2ebaec0 100644
> --- a/arch/powerpc/boot/wii.c
> +++ b/arch/powerpc/boot/wii.c
> @@ -22,10 +22,120 @@
>
> BSS_STACK(8192);
>
> -#define HW_REG(x) ((void *)(x))
> +#define HW_REG(x) ((void *)(x))
>
> -#define EXI_CTRL HW_REG(0x0d800070)
> -#define EXI_CTRL_ENABLE (1<<0)
> +#define EXI_CTRL HW_REG(0x0d800070)
> +#define EXI_CTRL_ENABLE (1<<0)
> +
> +#define MEM2_TOP (0x10000000 + 64*1024*1024)
> +#define FIRMWARE_DEFAULT_SIZE (12*1024*1024)
> +
> +
> +struct mipc_infohdr {
> + char magic[3];
> + u8 version;
> + u32 mem2_boundary;
> + u32 ipc_in;
> + size_t ipc_in_size;
> + u32 ipc_out;
> + size_t ipc_out_size;
> +};
> +
> +static int mipc_check_address(u32 pa)
> +{
> + /* only MEM2 addresses */
> + if (pa < 0x10000000 || pa > 0x14000000)
> + return -EINVAL;
> + return 0;
> +}
> +
> +static struct mipc_infohdr *mipc_get_infohdr(void)
> +{
> + struct mipc_infohdr **hdrp, *hdr;
> +
> + /* 'mini' header pointer is the last word of MEM2 memory */
> + hdrp = (struct mipc_infohdr **)0x13fffffc;
> + if (mipc_check_address((u32)hdrp)) {
> + printf("mini: invalid hdrp %08X\n", (u32)hdrp);
> + hdr = NULL;
> + goto out;
> + }
> +
> + hdr = *hdrp;
> + if (mipc_check_address((u32)hdr)) {
> + printf("mini: invalid hdr %08X\n", (u32)hdr);
> + hdr = NULL;
> + goto out;
> + }
> + if (memcmp(hdr->magic, "IPC", 3)) {
> + printf("mini: invalid magic\n");
> + hdr = NULL;
> + goto out;
> + }
> +
> +out:
> + return hdr;
> +}
> +
> +static int mipc_get_mem2_boundary(u32 *mem2_boundary)
> +{
> + struct mipc_infohdr *hdr;
> + int error;
> +
> + hdr = mipc_get_infohdr();
> + if (!hdr) {
> + error = -1;
> + goto out;
> + }
> +
> + if (mipc_check_address(hdr->mem2_boundary)) {
> + printf("mini: invalid mem2_boundary %08X\n",
> + hdr->mem2_boundary);
> + error = -EINVAL;
> + goto out;
> + }
> + *mem2_boundary = hdr->mem2_boundary;
> + error = 0;
> +out:
> + return error;
> +
> +}
> +
> +static void platform_fixups(void)
> +{
> + void *mem;
> + u32 reg[4];
> + u32 mem2_boundary;
> + int len;
> + int error;
> +
> + mem = finddevice("/memory");
> + if (!mem)
> + fatal("Can't find memory node\n");
> +
> + /* two ranges of (address, size) words */
> + len = getprop(mem, "reg", reg, sizeof(reg));
> + if (len != sizeof(reg)) {
> + /* nothing to do */
> + goto out;
> + }
> +
> + /* retrieve MEM2 boundary from 'mini' */
> + error = mipc_get_mem2_boundary(&mem2_boundary);
> + if (error) {
> + /* if that fails use a sane value */
> + mem2_boundary = MEM2_TOP - FIRMWARE_DEFAULT_SIZE;
> + }
> +
> + if (mem2_boundary > reg[2] && mem2_boundary < reg[2] + reg[3]) {
> + reg[3] = mem2_boundary - reg[2];
> + printf("top of MEM2 @ %08X\n", reg[2] + reg[3]);
> + setprop(mem, "reg", reg, sizeof(reg));
> + }
> +
> +out:
> + return;
> +}
>
> void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
> {
> @@ -42,5 +152,7 @@ void platform_init(unsigned long r3, unsigned long r4,
> unsigned long r5)
>
> if (ug_probe())
> console_ops.write = ug_console_write;
> +
> + platform_ops.fixups = platform_fixups;
> }
>
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